Active-Distributed Temperature Sensing to continuously quantify vertical flow in boreholes

作者：Read T^*; Bour O; Selker J S; Bense V F; Le Borgne T; Hochreutener R; Lavenant N

来源：Water Resources Research, 2014, 50(5): 3706-3713.

DOI：10.1002/2014WR015273

We show how a distributed borehole flowmeter can be created from armored Fiber Optic cables with the Active-Distributed Temperature Sensing (A-DTS) method. The principle is that in a flowing fluid, the difference in temperature between a heated and unheated cable is a function of the fluid velocity. We outline the physical basis of the methodology and report on the deployment of a prototype A-DTS flowmeter in a fractured rock aquifer. With this design, an increase in flow velocity from 0.01 to 0.3 m s(-1) elicited a 2.5 degrees C cooling effect. It is envisaged that with further development this method will have applications where point measurements of borehole vertical flow do not fully capture combined spatiotemporal dynamics.

• 出版日期2014-5